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Title: SiO masers in stars in the inner and outer galactic disk
Authors: Jiang, B.W.
Deguchi, Shuji
Balasubramanyam, R.
Issue Date: Feb-1999
Publisher: Astronomical Society of Japan
Citation: Publications of the Astronomical Society of Japan, 1999, Vol.51, p95-102
Abstract: Observations in the J=1--0, v=1 and v=2 ^{{28}} SiO and v=0 ^{{29}} SiO maser lines were made towards 97 outer- and 19 inner-disk IRAS sources with typical IRAS colors of AGB stars. 21 new ^{{28}} SiO and 1 new ^{{29}} SiO maser sources were detected above the 5 sigma level of ~ 1 Jy with the Nobeyama 45 m telescope. Collecting all of the observational data in SiO J=1--0 maser lines taken with a 45 m telescope, a comparison is made between the outer-disk, inner-disk, and bulge samples. The samples, themselves, align a sequence of mid-infrared color, flux at 12 mu m and IRAS variability index. The detection rates are 66%, 51%, and 31%, respectively, in the bulge, inner disk, and outer disk. This fact is consistent with the tendency of increasing proportion of C-rich stars in the IRAS sample and metallicity gradient with the galactocentric distance.
Description: Open Access.
ISSN: 0004-6264
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Copyright: 1999 Astronomical Society of Japan
Appears in Collections:Research Papers (A&A)

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